chore(docs): update CONFIG-VARS.md to include Multi AZ variables (PSCLOUD-314) (#328)

* doc: update CONFIG-VARS.md to include Multi AZ variabels

* doc: update CONFIG-VARS.md to include Multi AZ variabels

Author: niraj2347

docs/CONFIG-VARS.md

@@ -134,6 +134,7 @@ The application of a Kubernetes version in Google Cloud has some limitations whe
 | default_nodepool_local_ssd_count | Number 375 GB local ssd disks to provision | number | 0 | You can pick up to 24 ssd drives per node |
 | default_nodepool_taints | Taints for the default nodepool VMs | list of strings | [] | |
 | default_nodepool_labels | Labels to add to the default nodepool VMs | map | {} | |
+| default_nodepool_locations | Comma-separated list of zones for the default node pool. Ensures nodes are distributed across multiple zones | map | null | Use multiple values to enable multi-zone (multi-AZ) deployment for node pools. Example: `default_nodepool_locations = "us-east1-b,us-east1-c,us-east1-d"` |
 
 ### Additional Nodepools
 
@@ -150,6 +151,7 @@ Additional node pools can be created separate from the default nodepool. This is
 | local_ssd_count | Number of 375 GB local ssd disks to provision  | number | |
 | accelerator_count | Number of GPU accelerators associated with this nodepool | number | |
 | accelerator_type | Type of GPU accelerator associated with this nodepool | string | To list the available accelerators in your zone use the following command `gcloud compute accelerator-types list --filter="zone:( <your zone> )"` |
+| nodepools_locations | Comma-separated list of zones for additional node pools. Ensures new pools are deployed across multiple zones | string | Use multiple values to enable multi-zone (multi-AZ) deployment for node pools. Example: `nodepools_locations = "us-east1-b,us-east1-c,us-east1-d"` |
 
 The default values for the `node_pools` variable are: